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PARIS, FRANCE - JUNE 03: Roger Federer of Switzerland celebrates match point during the men's singles semi final match between Roger Federer of Switzerland and Novak Djokovic of Serbia on day thirteen of the French Open at Roland Garros on June 3, 2011 in Paris, France. (Photo by Clive Brunskill/Getty Images)

PARIS, FRANCE - JUNE 03:  Roger Federer of Switzerland celebrates match point during the men's singles semi final match between Roger Federer of Switzerland and Novak Djokovic of Serbia on day thirteen of the French Open at Roland Garros on June 3, 2011 in Paris, France.  (Photo by Clive Brunskill/Getty Images)

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PARIS, FRANCE - JUNE 08: Novak Djokovic of Serbia celebrates victory in his men's singles semi final match against Roger Federer of Switzerland during day 13 of the French Open at Roland Garros on June 8, 2012 in Paris, France. (Photo by Clive Brunskill/Getty Images)

PARIS, FRANCE - JUNE 08:  Novak Djokovic of Serbia celebrates victory in his men's singles semi final match against Roger Federer of Switzerland during day 13 of the French Open at Roland Garros on June 8, 2012 in Paris, France.  (Photo by Clive Brunskill/Getty Images)

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PARIS, FRANCE - JUNE 03: Roger Federer of Switzerland celebrates match point during the men's singles semi final match between Roger Federer of Switzerland and Novak Djokovic of Serbia on day thirteen of the French Open at Roland Garros on June 3, 2011 in Paris, France. (Photo by Matthew Stockman/Getty Images)

PARIS, FRANCE - JUNE 03:  Roger Federer of Switzerland celebrates match point during the men's singles semi final match between Roger Federer of Switzerland and Novak Djokovic of Serbia on day thirteen of the French Open at Roland Garros on June 3, 2011 in Paris, France.  (Photo by Matthew Stockman/Getty Images)

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PARIS, FRANCE - JUNE 03: Roger Federer of Switzerland celebrates a point during the men's singles semi final match between Roger Federer of Switzerland and Novak Djokovic of Serbia on day thirteen of the French Open at Roland Garros on June 3, 2011 in Paris, France. (Photo by Matthew Stockman/Getty Images)

PARIS, FRANCE - JUNE 03:  Roger Federer of Switzerland celebrates a point during the men's singles semi final match between Roger Federer of Switzerland and Novak Djokovic of Serbia on day thirteen of the French Open at Roland Garros on June 3, 2011 in Paris, France.  (Photo by Matthew Stockman/Getty Images)

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PARIS, FRANCE - JUNE 08: Roger Federer of Switzerland plays a forehand in his men's singles semi final match against Novak Djokovic of Serbia during day 13 of the French Open at Roland Garros on June 8, 2012 in Paris, France. (Photo by Clive Brunskill/Getty Images)

PARIS, FRANCE - JUNE 08:  Roger Federer of Switzerland plays a forehand in his men's singles semi final match against Novak Djokovic of Serbia during day 13 of the French Open at Roland Garros on June 8, 2012 in Paris, France.  (Photo by Clive Brunskill/Getty Images)